Event ID 552

Got a question, I keep seeing 2 accounts from 1am to 3am with the following info in the security of the event viewer.  My question is what exactly is this?

The user is "SYSTEM"
Computer = "servername"
Event Details:  Logon attempt using explicit credentials.
  Logged on user:
     Username:  SERVERNAME$
     Domain:      MYDOMAIN
     LogonID:     (0x0, 0x3E7)

  User whose credentials were used:
      Target user name:  first.last
      Target domain:       mydomain
      Target Logon GUID: {a very big number}

  Target server name:  localhost
  target server info:      localhost
  caller process ID:       2464
  Source network addr:
  Source port:               56055

So, is this someone who has hacked and got access to the first.last account?  The people I work with won't allow us to require complex passwords at all.


LVL 16
Kevin HaysIT AnalystAsked:
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There should be another event right next to this one that will tell you what priveledges were used (i.e. delete, change, etc). This will give you a better idea of what this individual is doing. In addition i would check and see what that IP address is (
After a cursory look at that server, it appears to be a blackberry.net box. Are you running BES? If so, then i wouldn't worry about it.

Good luck!

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Kevin HaysIT AnalystAuthor Commented:
Yes, this individual is using a blackberry.

right next to this is the system (user) with the following privileges assigned to the new login.



Yeah, this is fine then. Its just Blackberry calls into the store.
The IP address in that error belongs to RIM - who make Blackberry.

So it is the Blackberry service.

Kevin HaysIT AnalystAuthor Commented:
Thanks everybody :)

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